#5192 fix

packages/zod/src/v4/classic/tests/pickomit.test.ts

@@ -125,3 +125,31 @@ test("pick/omit/required/partial - do not allow unknown keys", () => {
   // @ts-expect-error
   expect(() => schema.partial({ $unknown: true }).safeParse({})).toThrow();
 });
+
+test("omit keep refine functions", () => {
+  const schema = z
+    .object({
+      value: z.number(),
+      allowsNegative: z.boolean(),
+      somethingElse: z.string(),
+    })
+    .refine(({ value, allowsNegative }) => {
+      if (allowsNegative) {
+        return true;
+      }
+      return value >= 0;
+    });
+
+  const schemaOmit = schema.omit({
+    somethingElse: true,
+  });
+
+  const schemaBsafeparsedBad = schemaOmit.safeParse({ value: -5, allowsNegative: false, somethingElse: "" });
+  expect(schemaBsafeparsedBad.success).toEqual(false);
+
+  const schemaBsafeparsedOk2 = schemaOmit.safeParse({ value: 5, allowsNegative: false, somethingElse: "" });
+  expect(schemaBsafeparsedOk2.success).toEqual(true);
+
+  const schemaBsafeparsedOk = schemaOmit.safeParse({ value: -5, allowsNegative: true, somethingElse: "" });
+  expect(schemaBsafeparsedOk.success).toEqual(true);
+});

packages/zod/src/v4/core/util.ts

@@ -619,7 +619,7 @@ export function omit(schema: schemas.$ZodObject, mask: object): any {
       assignProp(this, "shape", newShape); // self-caching
       return newShape;
     },
-    checks: [],
+    checks: currDef.checks,
   });
 
   return clone(schema, def);